This is true but not very interesting. Like literally every large tech company in the entire industry, Facebook has a specialized team of people that work on security --- it has one of the better versions of that team, for what it's worth. Just like ordinary Apple engineers, ordinary Google engineers, ordinary LinkedIn engineers, and ordinary Airbnb engineers, ordinary Facebook engineers don't have an end-to-end picture of how all of security at Facebook works.

There's no evidence that there was whistleblowing suppression about this issue anywhere at Facebook, is there?